Long-term (solar cycle) and seasonal variations of upflowing ionospheric ion events at DE 1 altitudes

Details Long-term (solar cycle) and seasonal variations of upflowing ionospheric ion events at DE 1 altitudes Long-term (solar cycle) and seasonal variations of upflowing ionospheric ion events at DE 1 altitudes

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.6395y&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, July 1, 1985, p. 6395-6407.

Physics

90

Annual Variations, Ionospheric Ion Density, Solar Cycles, Solar Terrestrial Interactions, Data Sampling, Dynamics Explorer 1 Satellite, Hydrogen Ions, Oxygen Ions, Statistical Distributions

Scientific paper

In the investigation conducted by Yau et al. (1984), the occurrence frequency distribution of upflowing ionospheric ions (UFI) in the auroral and polar cap ionosphere up to 23,300 km altitude was determined using the Energetic Ion Composition Spectrometer (EICS) data acquired in the first orbital cycle (18 months) of Dynamics Explorer 1 (DE 1). The present paper is concerned with the seasonal and long-term variations in the occurrence and composition characteristics of upflowing ions. The observed solar cycle and seasonal dependences of upflowing ionospheric ion occurrence morphology are summarized schematically in a graph. It is found that the acceleration altitude of O(+) UFI is modulated by the atmospheric scale height, which increases with increasing solar activity (EUV flux). The O(+) UFI occurrence frequency (and hence O(+) outflow) increases at solar maximum.

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